package com.heima.article.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONArray;
import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.heima.article.mapper.ApArticleContentMapper;
import com.heima.article.service.IApArticleService;
import com.heima.article.service.IArticleFreemarkerService;
import com.heima.common.constants.ArticleConstants;
import com.heima.file.service.FileStorageService;
import com.heima.model.article.pojos.ApArticle;
import com.heima.model.article.pojos.ApArticleContent;
import com.heima.model.search.vos.SearchArticleVo;
import freemarker.template.Configuration;
import freemarker.template.Template;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.kafka.core.KafkaTemplate;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.StringWriter;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
@Transactional
public class ArticleFreemarkerServiceImpl implements IArticleFreemarkerService {

    @Autowired
    private ApArticleContentMapper apArticleContentMapper;

    @Autowired
    private Configuration configuration;

    @Autowired
    private FileStorageService fileStorageService;

    @Autowired
    private IApArticleService apArticleService;

    /**
     * 生成静态文件上传到minIO中
     * @param apArticle
     * @param content
     */
    @Async
    @Override
    public void buildArticleToMinIO(ApArticle apArticle, String content) {
        try {
            //1.获取模板
            Template template = configuration.getTemplate("article.ftl");
            //2.获取数据模型
            ApArticleContent apArticleContent = apArticleContentMapper
                    .selectOne(Wrappers.<ApArticleContent>lambdaQuery().eq(ApArticleContent::getArticleId, apArticle.getId()));
            Map dataModel=new HashMap();
            dataModel.put("content", JSONArray.parseArray(apArticleContent.getContent()));

            //2.5 生成静态文件
            StringWriter out=new StringWriter();
            template.process(dataModel,out);
            //3.上传文件到minio中
            InputStream is=new ByteArrayInputStream(out.toString().getBytes());
            String path = fileStorageService.uploadHtmlFile("", apArticleContent.getArticleId() + ".html", is);
            //4.修改ap_article表中的static_url字段
            if(apArticle!=null){
                apArticle.setStaticUrl(path);
                apArticleService.updateById(apArticle);
            }
            //发送消息,创建索引
            createArticleESIndex(apArticle,content,path);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Autowired
    private KafkaTemplate<String,String> kafkaTemplate;

    /**
     * 创建文章ES索引
     * @param apArticle
     * @param content
     * @param path
     */
    private void createArticleESIndex(ApArticle apArticle, String content, String path) {
        SearchArticleVo searchArticleVo = new SearchArticleVo();
        BeanUtils.copyProperties(apArticle,searchArticleVo);
        searchArticleVo.setContent(content);
        searchArticleVo.setStaticUrl(path);
        kafkaTemplate.send(ArticleConstants.ARTICLE_ES_SYNC_TOPIC, JSON.toJSONString(searchArticleVo));
    }

}